CN102745680A - Method and device for preparing expanded graphite - Google Patents
Method and device for preparing expanded graphite Download PDFInfo
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- CN102745680A CN102745680A CN2012102503415A CN201210250341A CN102745680A CN 102745680 A CN102745680 A CN 102745680A CN 2012102503415 A CN2012102503415 A CN 2012102503415A CN 201210250341 A CN201210250341 A CN 201210250341A CN 102745680 A CN102745680 A CN 102745680A
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Abstract
The invention relates to a method and a device for preparing expanded graphite. The method for preparing expanded graphite is characterized by comprising the following steps: 1) preparing the device for preparing the expanded graphite; 2) insulating the air; 3) generating a high temperature plasma fire stream, wherein working gas is fed into a working gas inlet of a plasma torch, the plasma torch is ignited, the working gas is subjected to ionization puncture to be communicated through, and the high temperature plasma fire stream is ejected from the plasma torch; and 4) using the high temperature plasma fire stream to prepare the expanded graphite, wherein a helix conveyer is started to convey the expandable graphite into a furnace body, the expandable graphite is blown to the high temperature plasma fire stream under the action of the protective gas ejected by a gas ejection pipe so as to form vermiform expanded graphite, the expanded graphite is stacked at the bottom of the furnace body after being prepared, and after the furnace body is cooled, a material taking port is opened to take out the expanded graphite. The method is low in energy consumption and simple in equipment; and the prepared expanded graphite is high in expansion multiplying power.
Description
Technical field
The present invention relates to a kind of method and device thereof for preparing expanded graphite.
Background technology
Expanded graphite is as the intermediates of making soft graphite, is a kind of loose porous vermiform material that is obtained through oxidation, acidifying intercalation, washing, drying, high temperature puffing by natural flake graphite, has another name called graphite worm.Expanded graphite not only has good characteristics such as heat-resisting, anti-corrosion, the conduction, heat conduction, self-lubricating of natural graphite itself; But also have performances such as lightweight that natural graphite do not possess, softness, compressible, resilience; Therefore, expanded graphite meterial has than more excellent performance of materials such as asbestos, rubber and purposes widely.Various bands, plate, the sheet material that is pressed into expanded graphite has been widely used as the various dynamic and static sealing member of industries such as oil, chemical industry, electric power, metallurgy, machinery, aerospace, nuclear industry; For example, the flexible graphite article of processing with expanded graphite is described as the world " king of sealing " and has extremely important status in the mechanical seal field; Expanded graphite can be used as the microbe carrier that oil absorption material is used for waste oil recovery and waste water treatment in the environmental protection field; Become the heat radiating material of new generation of traditional metal materials such as replacing copper, aluminium by the graphite radiating plate of expanded graphite preparation.In addition, expanded graphite also can be used as Medical dressing, catalyzer, fixation support and solid electrolyte etc.
The raw material that is used to prepare expanded graphite in the past generally is big scale natural graphite, and granularity is because the size of granularity is influential to the quality of expanded graphite between 15 ~ 80 orders.Proved already that the formation mechanism of expanded graphite was that the intercalator in the remaining compound between graphite layers at high temperature gasifies, explosive type ground sprays from interlayer, and graphite linings is strutted becomes vermiform.Graphite particle size is big more, and the area of graphite flake is just big more, and at high temperature the power along the outside explosive type ejection of graphite layers is big more internally for remaining intercalator.This just is similar to gunpowder explosion, if behind pyrophoric ignition under the environment that opens wide, only can burn, only just can produce strong blast at the enclosed space powder burning.Along with graphite particle size reduces, if do not have very high temperature and high thermograde to make remaining intercalator instant vaporization, the ejection power of so this explosive type will reduce, and cause the expansion multiple of the expanded graphite that forms to reduce.When the raw material graphite particle size at 100 orders and when following, when adopting existing puffing furnace to produce because thermograde is not high enough, and remaining intercalator just overflows, can not the explosive type ejection, therefore no longer can strut graphite layers, also be no longer to form expanded graphite.Although the report that adopts chemical process to improve remaining intercalator explosive power is arranged, effect is unsatisfactory, and expansion multiple is lower, and cost is higher.And for the graphite Mineral resources, the flaky graphite reserves are few, and the flaky graphite resource in a lot of mines is exhausted or be bordering on exhaustion, thus also yield poorly, price is high.And ramentum graphite ore reserve is abundant, and output is big, cost is low, and therefore research prepares being significant of expanded graphite with thin crystalline flake graphite.
Summary of the invention
The object of the present invention is to provide a kind of method and device thereof for preparing expanded graphite, this method energy consumption is low, and the expansion multiplying power of the expanded graphite of preparation is high, and its device is simple.
For realizing above-mentioned purpose, the technical scheme that the present invention taked is: a kind of method for preparing expanded graphite is characterized in that it comprises the steps:
1) preparation of the device of preparation expanded graphite;
2) secluding air: close exhaust port; The expansible black lead of packing in the hopper; Vacuum pump is connected to vacuumizes the communication port place, start vacuum pump with the state that is evacuated in the body of heater (vacuum tightness is 0.01～0.05MPa), vacuumize finish after; To the logical shielding gas of gas ejector pipe, make the body of heater internal pressure return to barometric point;
3) produce high-temperature plasma flame stream: the work gas inlet mouth to plasma torch loads working gas; The plasma torch igniting; Working gas is ejected high-temperature plasma flame stream by the ionization puncture conducting from plasma torch, temperature is up to 3500～8000 ℃;
4) utilize high-temperature plasma flame stream preparation expanded graphite: start worm conveyor and in body of heater, carry expansible black lead; Expansible black lead blows to high-temperature plasma flame stream under the effect of the shielding gas of gas ejector pipe ejection; Formed vermiform expanded graphite; Fall into the bottom of body of heater, treat to open the material taking mouth taking-up after the body of heater cooling.
The expansible black lead of being selected for use is to adopt the thin crystalline flake graphite raw material of granularity below 100 degree reach after oxidation, acidifying intercalation, washing, drying, to make.All expansible black leads that can prepare the method acquisition of expansible black lead all can use.
Said shielding gas is selected from a kind of in argon gas, the nitrogen, is preferably nitrogen.
Said working gas is argon gas or nitrogen, is preferably nitrogen.
A kind of device of realizing the preparation expanded graphite of aforesaid method is characterized in that it comprises body of heater, hopper, worm conveyor and plasma torch; The top of body of heater is provided with mass transport mouth and exhaust port, and the bottom of body of heater is provided with the communication port that vacuumizes that is connected with vacuum pump, and the bottom of body of heater is provided with sealable material taking mouth; The output terminal of worm conveyor is fixedly connected with body of heater; The delivery port of worm conveyor is connected with the mass transport mouth of body of heater; The place, input aperture of worm conveyor is fixedly connected with hopper; Junction at body of heater and worm conveyor is provided with gas ejector pipe, and the delivery port of gas ejector pipe is connected with the mass transport mouth of body of heater; Plasma torch is arranged on the top of body of heater, and the spout of plasma torch is positioned at the cavity of body of heater, and the upper end of plasma torch is provided with work gas inlet mouth.
The double-deck vertical hollow circuit cylinder body structure that said body of heater is made up of liner and shell, shell adopt stainless steel to be made, and liner is that one deck is attached to the graphite brick on the outer casing inner wall.
Said plasma torch connects housing and power cabinet successively through cable.
Compared with prior art; The invention has the beneficial effects as follows: technology is novel, device is simple, energy consumption is low, intensification is rapid; Be to utilize plasma torch heating technique (high-temperature plasma flame stream), make expansible black lead meet the high temperature instantaneous expansion and form vermiform expanded graphite.Principle of the present invention is consistent with existing high temperature puffing stove; But owing to be that expansible black lead is directly sent into direct heating in the plasma flame stream with excessive temperature; Thermograde is very big, can be with the expanded graphite of thin crystalline flake graphite feedstock production expansion multiplying power >=300.This also is a main advantage of the present invention.In addition, plasma torch is the direct heating material, and heat utilization efficiency is high, and temperature can be regulated according to parameters such as working gas flow, pressure, electric current, voltages.And carrying out puffing with existing high temperature puffing stove, heat energy more is at heating furnace body except adding thermal material, and is dispersed in the environment, so energy consumption of the present invention is far below existing high temperature puffing stove.The present invention is suitable for thin crystalline flake graphite (the thin crystalline flake graphite of granularity below 100 degree reach) feedstock production expanded graphite.
Description of drawings
Fig. 1 prepares the structural representation of the device of expanded graphite for the present invention.
Among the figure: the 1-body of heater; The 11-liner; The 12-shell; The 13-exhaust port; 14-vacuumizes communication port; The 15-material taking mouth; The 2-hopper; The 3-worm conveyor; The 4-gas ejector pipe; The 5-plasma torch; 51-work gas inlet mouth; The 6-housing; The 7-power cabinet.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.
Consult shown in Figure 1, a kind of method for preparing expanded graphite, it comprises the steps:
1) preparation of the device of preparation expanded graphite;
2) secluding air: close exhaust port 13; The expansible black lead of packing in the hopper 2; Expansible black lead is to adopt the thin crystalline flake graphite raw material of granularity below 100 degree reach to make; Existing at present many disclosed methods that prepare expansible black lead, all these expansible black leads that can prepare the method acquisition of expansible black lead all can use; Vacuum pump is connected to vacuumizes communication port 14 places, start vacuum pump with the state that is evacuated in the body of heater 1 (vacuum tightness is 0.01～0.05MPa), vacuumize finish after; To gas ejector pipe 4 logical shielding gas; The shielding gas that is led to is selected from a kind of in argon gas, the nitrogen, is preferably nitrogen, makes body of heater 1 internal pressure return to barometric point; In order to ensure the nonoxidizing atmosphere in the stove, can repeatedly vacuumize---fill shielding gas;
3) produce high-temperature plasma flame stream: the work gas inlet mouth 51 to plasma torch 5 loads working gas; Working gas is argon gas or nitrogen; Be preferably nitrogen, power-on cabinet 7 makes plasma torch 5 igniting, and working gas is by the ionization puncture conducting; From plasma torch 5, eject high-temperature plasma flame stream, temperature is up to 3500～8000 ℃;
4) utilize high-temperature plasma flame stream preparation expanded graphite: start worm conveyor 3 and in body of heater 1, carry expansible black lead; Expansible black lead blows to high-temperature plasma flame stream under the effect of the shielding gas of gas ejector pipe 4 ejections; In the process through high-temperature plasma flame stream, the intercalation compound of insertion is met high temperature moment decomposition, produces a kind of along the axial thrust of graphite layers C; This thrust is much larger than the Van der Waals bonding force of graphite layers; Graphite layers is open under the effect of this thrust, and graphite particle is expanded along C direction of principal axis high power ground, has just formed vermiform expanded graphite; Fall into the bottom of body of heater 1, treat to open material taking mouth 15 taking-ups after body of heater 1 cooling.And those intercalation compounds are converted into volatile matter after decomposing gasification, and this volatile matter enters exhaust gas purification system through exhaust port 13 and handles under the effect of pyroreaction air pressure.
A kind of device of realizing the preparation expanded graphite of aforesaid method, it comprises body of heater 1, hopper 2, worm conveyor 3 and plasma torch 5; The top of body of heater 1 is provided with mass transport mouth and exhaust port 13, the bottom of body of heater 1 be provided be connected with vacuum pump vacuumize communication port 14, the bottom of body of heater 1 is provided with sealable material taking mouth 15; The output terminal of worm conveyor 3 is fixedly connected with body of heater 1; The delivery port of worm conveyor 3 is connected with the mass transport mouth of body of heater 1; The place, input aperture of worm conveyor 3 is fixedly connected with hopper 2, through worm conveyor 3 material in the hopper 2 is sent to body of heater 1, is provided with gas ejector pipe 4 in the junction of body of heater 1 and worm conveyor 3; Help further material to be blown in the body of heater 1, the delivery port of gas ejector pipe 4 is connected with the mass transport mouth of body of heater 1; Plasma torch 5 is arranged on the top of body of heater 1, and the spout of plasma torch 5 is positioned at the cavity of body of heater 1, and the upper end of plasma torch 5 is provided with work gas inlet mouth 51.
The double-deck vertical hollow circuit cylinder body structure that said body of heater 1 is made up of liner 11 and shell 12, shell 12 adopts stainless steel to be made, and liner 11 is that one deck is attached to the graphite brick on shell 12 inwalls.
Said plasma torch 5 connects housing 6 and power cabinet 7 successively through cable; Supply with power by power cabinet 7 to plasma torch 5, through the parameter such as housing 6 control working gas flows, pressure, electric current, voltage and then the temperature of regulating the flame stream of plasma torch 5 ejections.
Claims (7)
1. a method for preparing expanded graphite is characterized in that it comprises the steps:
1) preparation of the device of preparation expanded graphite;
2) secluding air: close exhaust port (13); The expansible black lead of packing in the hopper (2); Vacuum pump is connected to vacuumizes communication port (14) and locate, start vacuum pump the state that is evacuated in the body of heater (1), vacuumize finish after; To the logical shielding gas of gas ejector pipe (4), make body of heater (1) internal pressure return to barometric point;
3) produce high-temperature plasma flame stream: the work gas inlet mouth (51) to plasma torch (5) loads working gas, plasma torch (5) igniting, and working gas is ejected high-temperature plasma flame stream by the ionization puncture conducting from plasma torch (5);
4) utilize high-temperature plasma flame stream preparation expanded graphite: start worm conveyor (3) and in body of heater (1), carry expansible black lead; Expansible black lead blows to high-temperature plasma flame stream under the effect of the shielding gas of gas ejector pipe (4) ejection; Formed vermiform expanded graphite; Fall into the bottom of body of heater (1), treat to open material taking mouth (15) taking-up after body of heater (1) cooling.
2. a kind of method for preparing expanded graphite according to claim 1 is characterized in that, the expansible black lead of being selected for use is to adopt the thin crystalline flake graphite raw material of granularity below 100 degree reach after oxidation, acidifying intercalation, washing, drying, to make.
3. a kind of method for preparing expanded graphite according to claim 1 is characterized in that, said shielding gas is selected from a kind of in argon gas, the nitrogen.
4. a kind of method for preparing expanded graphite according to claim 1 is characterized in that said working gas is argon gas or nitrogen.
5. a device of realizing the preparation expanded graphite of aforesaid method is characterized in that it comprises body of heater (1), hopper (2), worm conveyor (3) and plasma torch (5); The top of body of heater (1) is provided with mass transport mouth and exhaust port (13), the bottom of body of heater (1) be provided be connected with vacuum pump vacuumize communication port (14), the bottom of body of heater (1) is provided with sealable material taking mouth (15); The output terminal of worm conveyor (3) is fixedly connected with body of heater (1); The delivery port of worm conveyor (3) is connected with the mass transport mouth of body of heater (1); The place, input aperture of worm conveyor (3) is fixedly connected with hopper (2); Junction at body of heater (1) and worm conveyor (3) is provided with gas ejector pipe (4), and the delivery port of gas ejector pipe (4) is connected with the mass transport mouth of body of heater (1); Plasma torch (5) is arranged on the top of body of heater (1), and the spout of plasma torch (5) is positioned at the cavity of body of heater (1), and the upper end of plasma torch (5) is provided with work gas inlet mouth (51).
6. the device of preparation expanded graphite according to claim 5; It is characterized in that; The double-deck vertical hollow circuit cylinder body structure that said body of heater (1) is made up of liner (11) and shell (12); Shell (12) adopts stainless steel to be made, and liner (11) is that one deck is attached to the graphite brick on shell (12) inwall.
7. the device of preparation expanded graphite according to claim 5 is characterized in that, said plasma torch (5) connects housing (6) and power cabinet (7) successively through cable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210250341.5A CN102745680B (en) | 2012-07-19 | 2012-07-19 | Method and device for preparing expanded graphite |
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| CN201210250341.5A CN102745680B (en) | 2012-07-19 | 2012-07-19 | Method and device for preparing expanded graphite |
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| CN102745680B CN102745680B (en) | 2014-10-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533123A (en) * | 2020-06-12 | 2020-08-14 | 黑龙江工业学院 | Device and method for preparing sulfur-free expandable graphite by using plasma |
| CN113680299A (en) * | 2021-09-02 | 2021-11-23 | 青岛超晟纳米新材料科技有限公司 | Cold wall reactor |
| CN115504466A (en) * | 2022-09-26 | 2022-12-23 | 鸡西环宇新能源材料有限公司 | Method and device for preparing expanded graphite |
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| CN1102192A (en) * | 1994-10-14 | 1995-05-03 | 秦树南 | Method for producing expansion graphite and its special purpose device |
| CN2335953Y (en) * | 1997-12-19 | 1999-09-01 | 夏云凯 | Chlorinating fluidizing furnace for purifying natural flaky graphite |
| CN101428792A (en) * | 2007-11-08 | 2009-05-13 | Sgl碳股份公司 | Expanded graphite and process for producing the expanded graphite |
| CN201495102U (en) * | 2009-07-30 | 2010-06-02 | 株洲红亚电热设备有限公司 | Small-size vertical type high temperature graphitized furnace |
| CN102126721A (en) * | 2011-04-27 | 2011-07-20 | 深圳市贝特瑞新能源材料股份有限公司 | Purification and graphitization method of graphite material |
-
2012
- 2012-07-19 CN CN201210250341.5A patent/CN102745680B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102192A (en) * | 1994-10-14 | 1995-05-03 | 秦树南 | Method for producing expansion graphite and its special purpose device |
| CN2335953Y (en) * | 1997-12-19 | 1999-09-01 | 夏云凯 | Chlorinating fluidizing furnace for purifying natural flaky graphite |
| CN101428792A (en) * | 2007-11-08 | 2009-05-13 | Sgl碳股份公司 | Expanded graphite and process for producing the expanded graphite |
| CN201495102U (en) * | 2009-07-30 | 2010-06-02 | 株洲红亚电热设备有限公司 | Small-size vertical type high temperature graphitized furnace |
| CN102126721A (en) * | 2011-04-27 | 2011-07-20 | 深圳市贝特瑞新能源材料股份有限公司 | Purification and graphitization method of graphite material |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533123A (en) * | 2020-06-12 | 2020-08-14 | 黑龙江工业学院 | Device and method for preparing sulfur-free expandable graphite by using plasma |
| CN111533123B (en) * | 2020-06-12 | 2024-03-15 | 黑龙江工业学院 | Device and method for preparing sulfur-free expandable graphite by using plasma |
| CN113680299A (en) * | 2021-09-02 | 2021-11-23 | 青岛超晟纳米新材料科技有限公司 | Cold wall reactor |
| CN115504466A (en) * | 2022-09-26 | 2022-12-23 | 鸡西环宇新能源材料有限公司 | Method and device for preparing expanded graphite |
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Effective date of registration: 20160318 Address after: 123099 Fuxin city of Liaoning Province, Xihe District four Zhen Huang Jia Gou Cun Patentee after: Liaoning Dianshi Technology Development Co Ltd Address before: 430074 Wuhan, Hongshan Province District, hung Chu street, No. 693 Patentee before: Wuhan Institute of Technology |
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